For the longest time I confused curd or <em>dahi</em> with yogurt. I was always told that curd and yogurt were just different names for the same thing. Some said that curd is what we call it in India and yogurt is an American term. Then again others claim that yogurt is thicker than curd and that is the difference. And to complicate matters, there's probiotic yogurt too. So curd, yogurt or probiotic, what's the difference anyway?